You have some options to do that.
using packages you can install ntop, darkstat, lighsquid..
using scripts or console, you can use
pftop
pftop -o age -f "dst 192.168.AAA.BBB"
pftop -o age -f "src 192.168.AAA.BBB"
rate
/usr/local/bin/rate -i rl0 -r 5 -Aa 20 -lc 192.0.0.0/8
iftop